See a list of possible causes in order from the most common to the least.

Sprains and strains are injuries to the body, often resulting from physical activity. These injuries are common and can range from minor to severe, depending on the incident. Most don't require medical attention.

Bursitis is an inflammation of the bursae, the fluid-filled sacs that help reduce friction where tendons, skin, and muscle tissues meet bones. Inflammation can cause discomfort and limit range of motion.

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